Method for Scalably Encoding and Decoding Video Signal

• US 20090067502A1
• Filed: 04/14/2006
• Published: 03/12/2009
• Est. Priority Date: 04/15/2005
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Jeon, Byeong Moon, Yoon, Doe Hyun, Park, Ji Ho, Park, Seung Wook
• Granted Patent: US 7,899,115 B2
• Time in Patent Office: Days
• US Class Current: 375/240.160
• CPC Class Codes: H04N 19/105 Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
• CPC Class Codes: H04N 19/13 Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
• CPC Class Codes: H04N 19/139 Analysis of motion vectors, e.g. their magnitude, direction, variance or reliability
• CPC Class Codes: H04N 19/187 the unit being a scalable video layer
• CPC Class Codes: H04N 19/33 in the spatial domain
• CPC Class Codes: H04N 19/52 by predictive encoding
• CPC Class Codes: H04N 19/59 involving spatial sub-sampling or interpolation, e.g. alteration of picture size or resolution
• CPC Class Codes: H04N 19/615 using motion compensated temporal filtering [MCTF]

Abstract

The present invention relates to a method for scalably encoding and decoding a video signal. In an embodiment of the present invention, motion information, such as reference indices, motion vector, modes, etc., for an enhanced layer can be derived from a base layer, and a reference index for an image block in the enhanced layer is determined using median criterion based upon the base layer. A reference index for a block, having the most pixels corresponding to those of the image block, in the base layer is selected as the reference index for the image block, and the nearer reference index is selected if more than one block in the base layer have the same pixels corresponding to those of the image block. And, a motion vector for the base layer block related to the selected reference index is selected as the motion vector for the image block.

Claims

1. A method of decoding a video signal, comprising:

deriving a corresponding pixel value of a corresponding block in a first layer, the corresponding pixel value being referred by a current pixel of a current block in a second layers,

obtaining a current pixel prediction value as the corresponding pixel value when a block type of the corresponding block is intra mode, and

reconstructing the current block based on the current pixel prediction value and a received residual value,

wherein the first layer represents a base layer, the second layer represents an enhanced layer.

2. The method of claim 1,

wherein the base layer is an upsampled base layer, a spatial scalability of the upsampled base layer corresponds to a spatial scalability of the enhanced layer.

3. The method of claim 1, further comprising:

determining partition information of the current block based on location information of each sub-block in the current block, if the current block is overlapped with a plurality of blocks in the base layer,

wherein the pixel prediction value of the current block is modified based on the determined partition information.

4. The method of claim 3,

wherein location information of the sub-block includes location information of an upper-left corner pixel of the sub-block.

5. The method of claim 3,

wherein the sub-block includes a 4×

4 block.

6. A method of decoding a video signal, comprising:

deriving motion information of corresponding blocks in a base layer, the motion information including motion vector and reference index,

deriving motion information of a current block in an enhanced layer based on the motion information of the corresponding blocks,

modifying a pixel prediction value of the current block based on a block type of the corresponding blocks in the base layer, and

reconstructing the current block by adding the modified pixel prediction value of the current block to a received residual value,

wherein the corresponding blocks in the base layer correspond to the current block in the enhanced layer.

7. The method of claim 6,

wherein the pixel prediction value of the current block is modified as a pixel value of a corresponding block when the block type of the corresponding block is intra mode.

8. An apparatus of decoding a video signal, comprising:

an enhanced layer decoder deriving a corresponding pixel value of a corresponding block in a first layer, the corresponding pixel value being referred by a current pixel of a current block in a second layer, and

obtaining a current pixel prediction value as the corresponding pixel value when a block type of the corresponding block is intra mode, and

reconstructing the current block based on the current pixel prediction value and a received residual value,

wherein the first layer represents a base layer, the second layer represents an enhanced layer.

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